Loud-speaking receiver unit



Dec. 1, 1925. 1,563,500

H. KOCH LOUD SPEAKING RECEIVER UNIT Filed Sept. 8. 1923 I N V EN TOR. HEN/7 f/OCf/ ATTORNEYS Patented Dec. 1, 1925.

UNITED STATS PATENT orrics.

HENRY KOCH, OF JAMAICA, NEW YORK, ASSIGNOR TO DICTOGRAPH PRODUCTS COR- PORATION, A CORPORATION OF VIRGINIA-,-

LOUD-SPEAKING RECEIVER UNIT.

Application filed September 8, 1923. Serial No. 661,596.

To all whom it may concern.

Be it known that I, HENRY K001i, a citizen of the United States, residing at Jamaica, in the county of Queens and State of New York, have invented certain new and useful Improvements in Loud-Speaking Receiver Units, of which the following is a full, clear, and exact description.

This invention relates to telephone receivers, particularly of the type commonly employed in radio telephone and telegraph receiving sets, and popularly known as loud speakers. The invention is in the nature of an improvement upon the receiver disclosed in my eopen'ding application Serial No. 628,709, filed March 30. 1923, and has for an object to provide an improved reeciver having all the advantages of the receiver disclosed in said copending application and so self-contained and compact as to be capable of use as a unitwhich may be attached to the tone arm of an ordinary talking machine,

in which case the amplifier of the talking machine would act as the amplifier for the unit. A furtherobject is to generally improve and simplify the construction of the receiver and reduce its cost of manufacture. Other objects and advantages will be apparent from the following description of an embodiment ofthe invention, and the novel features will be particularly pointed out hereinafter in claims.

Tn the accompanying drawing:

Fig. 1 is a sectional elevation of a re- .ceiverconstructed in accordance with the invention;

Fig. 2 is an end elevation of the same; and

Fig. 3 is a sectional elevation of the same, taken substantially along the line 3 3 of Figure l.

lln the illustrated embodiment of themvention, a cylindrical cup or casing 1 serves as a frame or support for the various parts of the receiver and its open end is closed by a plate 2 secured across an external peripheral flange 3 of the cup or casing by suitable means, such as screws l. A diaphragm 5 may be disposed across the open face of the cup or casing 1 and clamped between the flange 3 and the closure plate 2 so as to extend across the interior of the cup or casing in spaced relation to the closure plate 2. A

nipple 6 may be threaded into a, central aperture of the closure plate-2 so as to extend outwardly therefrom, and may be provided on its outer end with 'a bayonet slot 7 by means of which it may be attached to the usual tone arm of a talking machine in place of the sound box thereof. Thus, when the diaphragm 5 is vibrated in a manner to be explained, the. sound waves set up thereby will be conducted through the nipple 6 into the tone arm of the talking, machine, and

thence into the amplifier of the talking machine.

The frame or cup 1 is provided adjacent st1'uction having electromagnets 10 with polar ends 11. is mounted in the cup or casing 9 with the polar ends 11 extending at the open face thereof in proximity to the diaphragm- The diaphragm is either of magnetic material or carries a magnetic armature at its central portion so that the eleetromagnets 10, which are also arranged at the central portion of the diaphragm, will, when the current passing through them is varied, cause vibrations of the diaphragm in accordance with the variations of current. When the cup or casing 9 is adjusted axially to carry the electromagnets toward or from the diaphragn'i the effect of the electromagnets upon the diaphragm will be correspondingly varied.-

A stud 12 is provided upon closed face of the cup or casing 9 centrally thereof, and extends through an aperture 13 in the rear or closed end of the outer frame or casing 1. A nut 14 is threaded upon the portion of the stud which extends outwardly through the outer frame or casing 1. and when threaded further upon the stud will draw the stud through the aperature 13to a greater extent and thus draw the, electromagnets further from the diaphragm. A leaf-spring 15 is provided with an aperture intermediate its ends through which the stud 12 passes, and bears at its ends upon the rear or closed end of the frame or casing 1. The intermediate part of the spring 15 presses against a shoulder on the stud so as to constantly and yieldingly press the stud in a direction to carry the casing 9 and the electromagnets toward the diaphragm. When bsi lti

tltt

the nut 14 is operated in a direction to unscrew it from the stud, the spring 15 will shift the casing 9 and the electromagnets to ward the diaphragm.

A pin 16 carried by the rear or end face of the inner casing 9, passesslidably through an aperture 17 in the outer casing 1 eccentrically of the stud 12, so as to hold the inner casing against rotation relatively to the outer casing without lin'liting its slidable movement within the outer casing. The pin 16 also preferablypasses through an aperture or slot 15 in the spring 15 so as to hold the latter against rotation about the stud 12. Suitable circuit wires 18 lead through apertures in the outer casing 1, and in the inner casing 9, to. the electromagnetic unit so that a current passing through the circuit wires 18 will modify the magnetic field normally exerted upon the diaphragm by the polar ends 11 of the magnets. The circuit wires 18 are connected to any suitable telephone or radio rece ving circuit for the source of variable current.

A. button 1f) is rotatably mounted upon the extreme outer end of the stud l2 and is secured thereon by a headed screw 20 which is countersunk into the outer face of the button 19, and threaded into the outer end of the stud 12. The button 19 is provided upon its inner face with two concentric annular flanges 21 and 22 which surround the nut l l. A pin 23 passesradially of the button through an aperture in the inner flange 22, and is provided with a reduced end 24: which passes through a smaller aperture in the outer flange 21, the shoulder at the beginning of the reduced end limiting outward movement of the pin through the flanges. The pin also extends inwardly from the inner flange 22 and has a tooth 25 which. is adapted to engage in one of a set of notches 26 provided in the periphery of the nut 14, the notches 26 extending in a direction lengthwise of the stud 19. Thus, when the button 19 is rotated, it will, by reason of the engagement of the pin 23 with the nut, produce a corresponding rotation of the nut.

The extension 24 of the pin 23 projects outwardly beyond the periphery of the button 19, and serves as an indicating pointer for cooperation with a scale 27 provided upon the rear face of the outer casing or frame, in order to indicate the different angular positions to which the button 19 may be rotated. A pin 28 projects from the rear face of the outer casing or frame 1 into the annular groove'formed between the flanges 21 and 22 of the button, so as to form a limiting stop for the pin 23. The pin 28 thus limits the rotation of the button ,19 to approximately one revolution. washer 29' is provided with struck-up peripheral tongues 30, and is disposed betweep the nut 14 and the end of the casing or frame 1 with the struckup tongues pressing against the ends of the flanges 21 and 22. This pressure of the tongues 30 upon the button serves to hold it against the head of the screw 20 during all of the various adjustments of the but-ton, since the. movement of the nut upon the stud will cause a relative movement between the nut and the button 19.

In the assembly of the receiver, the parts are assembled in the manner illustrated, and before the button 19 is applied to the stud, the device is tested to determine the normal or average desired position for the electro magnets relatively to the diaphragn'i. The button is thenplaced upon the stud 12 with the pin 23 extending into one of the slots 26, so that the pointer 2 l'will indicate the. zero or other desired mark on the scale 27. This is necessary because the button is limited to one rotation, and the relative movement; of the electromagnets by rotation of the button should be such as to be within the desired operating limits of movement. Jith this arrangement it is unnecessary to be as accurate -in positioning the polar ends of the clectromagnets at an accurate distance from the stud 12 and consequently the cost of manufacture is considerably reduced with the less degree of accuracy required for the parts. This enables the parts to be made largely by stamping machinery.

To vary the effect of the electromagnetic unit upon the diaphragm, it is merely necessary to rotate the button 19 and thus shift the electromagnets toward or from the diaphragm. In use, the operator merely rotates the button 19 until the maximum loudness and clearness of the sounds coming from the amplifying horn of the talking machine are obtained.

It will be understood that while the receiver illustrated is of the type adapted for attachment to the tone arms of talking machines in place of the usual sound box, it may be also used for attachment to other amplifying horns not related to talking machines Without departing from the spirit and scope of the invention. It also will be understood that various changes in the details and arrangement of parts, herein described and illustrated for the purpose of explaining the nature of the invention, may be made by those skilled in the art within the principle and scope of the invention as'expressed in the appended claims. 1

' I claim:

1. A telephone receiver comprising a frame, a diaphragm mounted in said frame, an electromagnetic unit slidingly mounted in said frame for movement toward and from the diaphragm and adapted to actuate said diaphragm, a stud carried by the unit frame for yieldingly pressing the unit in one direction toward or from the diaphragm, a nut on said stud acting against the frame to draw the unit in a direction against the action of the spring, whereby adjustment of the nut serves to adjust the unit toward or from the diaphragm and thereby vary its influence thereon, and an Operating button rotatably mounted on said stud adjoining /said nut, said nutand button having co- 1 operating coupling means whereby they may in relatively different angular positions, be coupled together for rotation as an entity,

said button and frame having cooperating indicating means for indicating the extent of relative rotary movement between them.

A' telephone receiver comprising a cylindrical cup, a diaphragm disposed across the'open end of the cup, a membersecured across the open end of the cup for clamping said diaphragm at its periphery to the cup with freedom for vibration at its center, said member being apertured to permit of the egress of sound waves set up by the diaphragm, a second cup in the first cup and slidable therein toward and from the diaphragm, an electromagnetic device-mounted in the second cup and movable therewith toward and from the diaphragm which it controls, a threaded stud extending from an end of the second cup and slidable through an aperture in thefirst cup, a spring dlsposed in the first cup and-yieldingly stressing the second cup in a direction toward or from the diaphragm, a nut on" said stud acting against the first cup to drawthe second a cup 1n an opposite direction against the action of the spring, whereby adjustment of the nut serves to adjust the second cup and its electromagnetic device toward or from the diaphragm to vary the influence of the device thereon, and means for preventing relative rotation of the two cups.

3. A telephone receiver comprising a cylindrical cup, a diaphragm disposed across the open end of the cup, a member secured across the open end of the cup for clamping said diaphragm at its periphery tothe cup with freedom for vibration at its center, said member being aperturedto. permit of the eglress of sound waves set up by the diap ragm,a second cup in the first cup and slidabletherein toward'and from the diaphragm, an electromagnetic device mount ed in the second cup and movable therewith toward and'from the diaphragm which it controls, a threaded stud extending. from an end of the second I cup and slidable through an aperture in the first cup, a spring disposed "in the first cup and yieldlngly stressing the second cup in a direction toward or from the diaphragm, a nut on said stud acting against the first-cup to draw the second cup in anopposit'e direction against the action of the spring, whereby adjustment of the nut serves to adjust the second cup and its electromagnetic device toward or from the diaphragn'i to vary the influence of the device thereon, means for preventing relative rotation of the two cupsand a tubular nipple adapted for attachn'ient to a tone arm of a talking machine and carried by the said member in alignment with its aperture.

4:. A telephone receiver comprising a frame, a diaphragm mounted in said frame, an electromagnetic unit slidingly mounted in said frame for movement toward and from the diaphragm and adapted to actuate ,said diaphragm, a stud carried by the unit and passing through an aperture in the frame, a spring acting between the unit and frame for yieldingly pressing the unit in one direction toward or from the diaphragm, a nut on said-stud acting against the frame to draw the unit in a direction against the action of the spring, whereby adjustment of the nut serves to adjust the unit toward or from the diaphragm and thereby vary its influence thereon, an operating button rotatably mounted on said stud adjoining said nut, said button having anannular flange on its inner face embracing the periphery of the nut and a pin carried by the flange and extending inwardly and outwardly thereof, the periphery of the nut having therein a plurality of slots running parallel withits axis and into any one of which the inner end of the pin may extend to couple the button and nut for concomitant rotation together.

5. A telephone receiver comprising a frame, a diaphragm mounted in said frame,

an electromagnetic unit slidingly mounted in said frame for movement toward and from the diaphragm and adapted to actuate said diaphragm, a stud carried by the unit and passing through an aperture in the frame, a spring acting between the unitand frame for yieldingly pressing the unit in one direction toward or from the diaphragm, a nut on said stud acting against the frame to draw the unit in a direction against the action of the spring, whereby adjustment of the nut serves to ad ust the unit toward or from the diaphragm and thereby vary its influence there- -on, an operating button rotatably mounted on said stud adjoining said nut, said button having an annular flange on its inner face embracing the periphery of the unit, a in carried by the flange and extending inwar l and outwardly thereof, the periphery of the nut having therein a plurality of slots running parallel with its axis and into any one of which the inner end of the pin may extend to couple the button and not for concomitant ,rotation together, and an abutment with which the said pin engages for limiting rotation of the button.

6. The receiver subgtgntially as set forth in claim 5 in which the rame carries a scale over which the outer end of the pin travels for indicating the relative angular positions of the button.

- 7. The receiver substantially as set forth in claim in which the frame carries a scale over which the outer end of the pin travels for indicating the relative angular positions of the button.

8. A telephone receiver comprising a frame, a diaphragm mounted in said frame, an electromagnetic unit slidingly mounted in said frame for movement toward and from the diaphragm and adapted to actuate said diaphragm, a stud carried by the unit and passing through an aperture in the frame, a spring acting between the unit and frame for yieldingly pressing the unit in one direction toward or from the diaphragm, a nut on said stud acting against the frame to draw the unit in a direction against the action of the spring, whereby adjustment of the nut serves to adjust the unit toward or from the diaphragm and thereby vary its influence thereon, an operating button rotatably mounted on said stud adjoining said nut, said button having a pair of concentric annular flangeson its inner face, both flanges embracing the periphery of the nut, said nut having in its periphery a plurality of slots running parallel with its axis, a pin passing radially through both of the flanges, and at its inner end entering any of the slots in the periphery of the nut withv which it may be aligned when the flanges are passed over the nut and a stud on said frame running in the groove between the annular flanges and in the path of the pin for limiting rotation of the button.

9. The receiver substantially as set forth in claim 8 in which the frame carries a scale" a over WlllCll the outer end of the pin travels for indicating the relative angular positions of the button.

10. A telephone receiver comprising a frame, a diaphragm mounted in said frame,

an electromagnetic unit 'slidingly mounted in said frame for movement toward and from the diaphragm and adapted to actuate said diaphragm, a stud carried by the unit and passing through .an aperture in the frame, a spring acting between the unit and frame for yieldingly pressing the unit in one direction toward or from the diaphragm, a nut on said stud acting against the frame to draw the unit in a direction against the action of the spring, whereby adjustment of the nut serves to adjust the unit toward or from the diaphragm and thereby var; is influence thereon, an operating button loose "on the outer end of the stud and adjoining the said nut, a screw threaded intothe outer end of the stud with its head overreaching the button for confining it upon the stud, "a spring washer for yieldingly holding the button against the head of the screw, said button having an annular flange on its inner face embracing the periphery of the nut, and a pin carried by the flange and extending inwardly and outwardly thereof, the periphery of the nut having therein a plurality of slots running parallel with its axis and into any one of which the inner end of the pin may extend to couple the button and nut for concomitant rotation together.

In witness whereof, I hereunto subscribe my signature.

HENRY KOCH. 

